president obama told the new republican, quote, i'm a big football fan, but i have to tell you, if i had a son, i'd have to think long and hard before i let him play football. the 49ers reaction? >> president obama feels that way, then there will be a little less competition for jack harbaugh when he gets older. that's the first thing to my mind, if other parents are thinking that way. but it's still early, jack. only five months old. but he's a really big kid. he's got an enormous head. >> what's his 40 time? >> we don't have a 40 on him yet. but his wing span is a plus one. as soon as he grows into that head, he's gonna be something. >> reporter: while jim harbaugh had fun with the topic, alex boone took exception and said the benefits outweigh the risks. >> i love our president obama. i don't mean to disrespect him. but i wouldn't mind if my kids played football. this is america's past time. once you play, you understand so much more about life and being in a group, being around guys. you build a brotherhood, learn to rely on each other. it is a physical game but it's a fun game.